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#!/bin/sh
# This script runs `musl-cross-make` to prepare C toolchain (Binutils, GCC, musl itself)
# and builds static libunwind that we distribute for static target.
#
# Versions of the toolchain components are configurable in `musl-cross-make/Makefile` and
# musl unlike GLIBC is forward compatible so upgrading it shouldn't break old distributions.
# Right now we have: Binutils 2.31.1, GCC 9.2.0, musl 1.1.24.
# ignore-tidy-linelength
set -ex
hide_output() {
set +x
on_err="
echo ERROR: An error was encountered with the build.
cat /tmp/build.log
exit 1
"
trap "$on_err" ERR
bash -c "while true; do sleep 30; echo \$(date) - building ...; done" &
PING_LOOP_PID=$!
"$@" &> /tmp/build.log
trap - ERR
kill $PING_LOOP_PID
rm /tmp/build.log
set -x
}
ARCH=$1
TARGET=$ARCH-linux-musl
# Don't depend on the mirrors of sabotage linux that musl-cross-make uses.
LINUX_HEADERS_SITE=https://ci-mirrors.rust-lang.org/rustc/sabotage-linux-tarballs
OUTPUT=/usr/local
shift
# Ancient binutils versions don't understand debug symbols produced by more recent tools.
# Apparently applying `-fPIC` everywhere allows them to link successfully.
# Enable debug info. If we don't do so, users can't debug into musl code,
# debuggers can't walk the stack, etc. Fixes #90103.
export CFLAGS="-fPIC -g1 $CFLAGS"
git clone https://github.com/richfelker/musl-cross-make # -b v0.9.9
cd musl-cross-make
# A few commits ahead of v0.9.9 to include the cowpatch fix:
git checkout a54eb56f33f255dfca60be045f12a5cfaf5a72a9
# Fix the cfi detection script in musl's configure so cfi is generated
# when debug info is asked for. This patch is derived from
# https://git.musl-libc.org/cgit/musl/commit/?id=c4d4028dde90562f631edf559fbc42d8ec1b29de.
# When we upgrade to a version that includes this commit, we can remove the patch.
mkdir patches/musl-1.1.24
cp ../musl-patch-configure.diff patches/musl-1.1.24/0001-fix-cfi-detection.diff
hide_output make -j$(nproc) TARGET=$TARGET MUSL_VER=1.1.24 LINUX_HEADERS_SITE=$LINUX_HEADERS_SITE
hide_output make install TARGET=$TARGET MUSL_VER=1.1.24 LINUX_HEADERS_SITE=$LINUX_HEADERS_SITE OUTPUT=$OUTPUT
cd -
# Install musl library to make binaries executable
ln -s $OUTPUT/$TARGET/lib/libc.so /lib/ld-musl-$ARCH.so.1
echo $OUTPUT/$TARGET/lib >> /etc/ld-musl-$ARCH.path
# Now when musl bootstraps itself create proper toolchain symlinks to make build and tests easier
if [ "$REPLACE_CC" = "1" ]; then
for exec in cc gcc; do
ln -s $TARGET-gcc /usr/local/bin/$exec
done
for exec in cpp c++ g++; do
ln -s $TARGET-g++ /usr/local/bin/$exec
done
fi
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